Exporting render image into Photoshop and still get material distortions
No need to take the 3D to photoshop. Bring the image to blender instead.

Go to user preferences (Ctrl ALt U)
Enable the import images as planes addon.



On the 3D viewport you can add images as plane (ShiftA).
Then select the *psd (PNG, Tiff, JPEG, etc) image you want to import.